Docker My Note: A Complete Reference Guide

Introduction

Docker is a popular tool in the DevOps field that simplifies the deployment and management of applications.

In this article, we will explore important notes about Docker, including basic concepts, common commands, and useful tips. Whether you are a beginner or have some experience, these notes will help you optimize your work with Docker. To learn more, visit Docker My Note.

Docker My Note: Your Go-To Guide for DevOps Success

Cannot connect to the Docker daemon. Is the docker daemon running on this host?

Solve the problem: Add this user to the docker group.

Detach and Attach

• Detach : Ctrl-p + Ctrl-q
• Attach: docker attach [container]

Why can not detach?

Solve the problem: docker run with “-i”, “-t” options. http://stackoverflow.com/questions/20145717/how-to-detach-from-a-docker-container

Docker runs without -it, but attach, so can not type CTRL-C

Close your terminal! Anything OK.

To safely detach…

Docker runs without “-i”, “-t” options. But you want to detach, if you hit Ctrl-C then the docker process be killed.
To avoid it, attach with

--sig-proxy=false

You want to log in to a container…

docker exec -it [container-name] /bin/bash

start on os-startup

docker command

 --restart=always

docker-compose add restart: always in docker-compose.yaml file

search a docker image in hub.docker.com

docker search nginx

Download a docker image from hub.docker.com

docker image pull <image_name>:<image_version/tag>

List out docker images from your local system

docker image ls

Expose your application to host server

docker run -d -p <host_port>:<container_port> --name <container_Name> <image_name>:<Image_version/tag>

List out running containers

docker ps

List out all docker containers (running, stpooed, terminated, etc…)

docker ps -a

Stop/Start a container

docker stop <container_id>

docker start <container_id>

Remove a container

docker rm <container_id>

Conclusion

Docker has become an indispensable tool in the modern DevOps toolkit. Through this article, we hope you have grasped the basic knowledge and useful commands to effectively apply Docker in your work. If you want to learn more and stay updated with the latest information about Docker, don’t forget to visit Docker My Note. Let Docker help you simplify and optimize your application deployment process.